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Note 15 Derivatives Hedge accounting breakdown by type of risk and type of hedge (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging € 1,891 € 1,805 € 1,991
Derivative financial liabilities held for hedging 3,303 2,626 2,318
Interest rate risk [member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 656 697 989
Derivative financial liabilities held for hedging 376 322 525
Interest rate risk [member] | OTC Options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 656 697 989
Derivative financial liabilities held for hedging 376 322 525
Interest rate risk [member] | Organized market options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Equity risk [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Equity risk [Member] | OTC Options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Equity risk [Member] | Organized market options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Foreign exchange and gold risk [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 259 463 435
Derivative financial liabilities held for hedging 83 135 350
Foreign exchange and gold risk [Member] | OTC Options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 259 463 435
Derivative financial liabilities held for hedging 83 135 350
Foreign exchange and gold risk [Member] | Organized market options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Credit risk [member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Commodities risk [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Other risk [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0
Derivative financial liabilities held for hedging 0 0
Fair value risk [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 915 1,160 1,424
Derivative financial liabilities held for hedging 459 457 874
Interest rate risk hedges cash flow [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 470 228 154
Derivative financial liabilities held for hedging 2,763 1,786 1,055
Interest rate risk hedges cash flow [Member] | OTC Options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 454 226 154
Derivative financial liabilities held for hedging 2,763 1,786 1,041
Interest rate risk hedges cash flow [Member] | Organized market options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 16 2 0
Derivative financial liabilities held for hedging 0 15
Equity instruments risk hedge cash flow [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Foreign exchange and gold risk hedge cash flow [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 239 180 225
Derivative financial liabilities held for hedging 46 79 55
Foreign exchange and gold risk hedge cash flow [Member] | OTC Options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 239 180 225
Derivative financial liabilities held for hedging 45 79 50
Foreign exchange and gold risk hedge cash flow [Member] | Organized market options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 1 0 5
Credit risk hedge cash flow [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Commodities risk hedge cash flow [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Other risk hedge cash flow [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Cash flow hedges [member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 708 408 379
Derivative financial liabilities held for hedging 2,809 1,865 1,111
Hedges of net investment in foreign operations [member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 213 198 166
Derivative financial liabilities held for hedging 26 196 139
Portfolio fair value hedges of interest rate risk [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 7 18 18
Derivative financial liabilities held for hedging 8 95 170
Portfolio cash flow hedges of interest rate risk [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 48 21 3
Derivative financial liabilities held for hedging 1 13 23
Derivatives hedge accounting [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 1,891 1,805 1,991
Derivative financial liabilities held for hedging 3,303 2,626 2,318
Derivatives hedge accounting [Member] | Of which OTC credit institutions [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 1,577 1,454 1,718
Derivative financial liabilities held for hedging 2,911 2,248 1,965
Derivatives hedge accounting [Member] | Of which OTC other financial corporations [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 297 349 273
Derivative financial liabilities held for hedging € 391 € 378 € 333